Method isA

core/src/main/java/org/apache/calcite/sql/SqlNode.java:115–117

Returns whether this node is a member of an aggregate category. For example, node.isA(SqlKind.QUERY) returns true if the node is a SELECT, INSERT, UPDATE etc. This method is shorthand: node.isA(category) is always equivalent to {@code node.getKind().belongsTo(category

(Set<SqlKind> category)

   * @return Whether this node belongs to the given category.
   */
  public final boolean isA(Set<SqlKind> category) {
    return getKind().belongsTo(category);
  }

  @Deprecated // to be removed before 2.0
  public static SqlNode[] cloneArray(SqlNode[] nodes) {